The county is investigating Griffin's relationship with the school system's former electronic security systems vendor, Professional Security Consultants and Design.

Deputy Chief of Security Rodney Beverly has served as acting chief of security since Griffin was placed on leave.

Dr. McIntyre said he expects to learn more about the investigation in the coming weeks in a report from attorney Ruth Ellis. She is investigating Griffin's relationship with PSCD.

"Student safety and school security continue to be our highest priorities every single day, and we will continue to do everything in our power to provide a safe and productive learning environment for our children in the Knox County Schools," McIntyre said.